How to normazile custom text nodes

[DonTomato]

So, I've extended a TextNode with a lang attribute:

const DEFAULT_LANG = undefined;

const langState = createState('lang', {
    parse: value => (typeof value === 'string' ? value : DEFAULT_LANG)
});

export class LangTextNode extends TextNode {
    $config() {
        return this.config('lang-text', {
            extends: TextNode,
            stateConfigs: [{flat: true, stateConfig: langState}]
        });
    }

    setLang(lang) {
        $setState(this, langState, lang);
    }

    getLang() {
        return $getState(this, langState);
    }
    
    createDOM(config) {
       ...
    }

    updateDOM(prevNode, dom, config) {
        ...
    }
}

I also replaced a TextNode according to the docs:

const editorConfig = {
    ...
    nodes=[
        // Don't forget to register your custom node separately!
        LangTextNode,
        {
            replace: LangTextNode,
            with: (node) => {
                return $createLangTextNode(node.__text),;
            },
            withKlass: LangTextNode,
        }
    ]
}

And everything works as it should, except that when I remove formatting from a piece of text, the nodes don’t get merged as they used to. So my question is: why does this happen? Have I missed something?

[etrepum]

You need to override isSimpleText to return true https://lexical.dev/docs/api/modules/lexical#issimpletext

[DonTomato]

It works, thanks a lot!